Regarding Tulpas

[BrownEye]

a servitor would be absorbed after its tasks had been complete

This happens when it has been programmed to do so. A servitor is not always consciously created, and does not always absorb or return. This is a large part of why the world is a messy place, people are not aware of their own thoughts, and not aware of what their thoughts create. This is the main reason I began using shielding, to keep the uncleaness of others from attempting to attach to myself or my electronics.